MobileWeb: Complete Ti.UI.Window implementation

Extends Widget (View, Evented).

Constructor needs to support being passed in a "url" property.

Remove "blur" event from close() method since SuperView's close() method does it for us already.

Methods:

• close() - done!
• open() - done!

Properties:

• modal - bool - if true, set z-index to something huge [stage]
• orientation - done!
• title - done!
• titlePrompt
• titleid

Constants:

• url

Events:

• blur - done!
• close - done!
• focus - done!
• open - done!

Update API docs with support for properties:

• modal
• transform